Created attachment 149815 [details] Screenshot of error message. SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** STEPS TO REPRODUCE 1. Compose an email message 2. Choose "send" OBSERVED RESULT Message is moved to outbox folder, and hangs up there. Attempts to send using "send queued messages" always fail. The only way I know of to fix it is to reboot the system. When I do reboot, an error message is displayed: E-mail Sending Failed Failed to get D-Bus interface of mailfilteragent. This is an intermittent error. I suppose one in a thousand (0.1%) of the messages I send fail this way. A screenshot of the error message is attached. EXPECTED RESULT The KMail composer should be able to connect with mailfilteragent, and thence with my email provider via the internet. This happens about 99.9% of the time. And if there is an error with D-Bus, I should be able to see the notification without rebooting the whole system. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Kernel version 5.15.41-gentoo (available in About System) KDE Plasma Version: 5.24.5 KDE Frameworks Version: 5.92.0 Qt Version: 5.15.4 ADDITIONAL INFORMATION Not a real big deal. But it happens often enough to be a nuisance. That's why I'm posting a bug report.